Introduction

The disk drive port is a versatile port that can be used for more than disk drives. It supports data rates of 250,000 and 500,000 BAUD and it is DMA driven.

You can add extra floppy disk drives, for Amiga, PC,  MAC, C64 and a few more and some interesting interfaces. The problem with using this port is that the software to use it will be complex (at least in my opinion)

The Amiga use the Shugart bus for the disk drive interface, the same on PC's do, so with a small interface circuit, you can add a PC floppy drive as a replacement (though not high density).

External disk drive connector

           Note: / indicates an active low signal                      

Type

Pin

Signal

Description

Input

1

/RDY

Disk ready signal

Input

2

/DKRD

Read data from disk

 

3

GND

 

 

4

GND

 

 

5

GND

 

 

6

GND

 

 

7

GND

 

Output

8

/MTRX

Motor On/Off

Output

9

/SEL2

Select drive 2

Output

10

/DRES

Disk reset (turn motors off)

Input

11

/CHNG

Disk change. Logic 0 = no disk.

 

12

+5V

250 mA max.

Output

13

/SIDE

Side selection (top or bottom)

Input

14

/WPRO

Disk is write protected

Output

15

/TK0

Disk head at track 0

Output

16

/DKWE

Switch to write mode

Output

17

/DKWD

Write data to the disk

Output

18

/STEP

Move the read/write head

Output

19

/DIR

Direction of head movement, low = move toward centre.

Output

20

/SEL3

Select drive 3

Output

21

/SEL1

Select drive 1

Input

22

/INDEX

Index signal from the drive

 

23

+12 Volts

160 mA max.

To search aminet for floppy disk related files, click here

Aminet Files,

DriveTest.lha 

Short: Controls & shows floppy drive signals.

- This programs allows you to directly control signals to floppy drives
- Shows which signals drives give to your Amiga
- GUI interface
- Very useful for repairing external/internal drives etc.
- System pure - when running, drives are allocated by disk.resource

TrackDiskSync.lha

Short:    Recalibration tool for floppy drives

Requires: Kickstart 2.04 or better. One working floppy drive. A joystick. Phillips screwdriver set. Nail polish.

Introduction:

This little tool can be used to re-calibrate floppy drives manually. This does not mean that I recommend doing so. In case you're "mechanically declined", you should leave this to an expert, or should consider buying a new drive. In case the drive is broken, it is broken, and this tool won't help much.

De-calibrated drives show the following symptoms: They read disks written by themselves fine, but fail to read other disks reliable, and disks written to by the decalibrated drive do no longer work reliable in other disk drives. In case the drive just doesn't work at all anymore, something more is broken. In either
case, you run into the risk of damaging your hardware even more. Note that I cannot give any guarantee whatsoever that this program and the hints given here are correct, free of errors, etc... The entire risk is up to you. If you break your drive or your computer, tough luck! I refuse to take any responsibilities.

 

PCFloppy2Amiga.lha

Short:    =Use 1.44 PC drives as Amiga HD drives.=

PCFloppy2Amiga is a package describing how the author made a DD (880 KB) floppy drive and a HD (880/1760 KB) floppy drive using a 3.5 inch PC 1.44 Mb floppy drive.
There is also documentation on how to connect 5" drives (440/880 KB).
It consists of:
     - AmigaGuide file + iff pictures
     - DRIVEID program to check the identification of
       the drive in the amiga.
     - DriveSpeed to check rotational speed of your drive
     - DriveTest archive included.

The drives are completely compatible with the standard amiga (HD/DD) floppy drives. There is no need for drivers if you use kickstart 2.x and higher.

Floppy_fix.lha

Short:    Fix for the floppy problem of newer Amiga 1200

This  text  and picture shows how to fix the problem that newer Amiga 1200 (of  Amiga  Technologies)  has  with  NDOS  disks  and df0:, with a little explanation of why they fail.

Maybe Amiga Technologies could add this hack to his manufacturing process, and so return to the Amiga the high compatibility that it always had ;-))

By Ian Stedman, 19th July 2002

Disk-drive port

Updated 23 February 2010